Air Filter Replacement RFQ Checklist: Type, Size, Efficiency, Frame

Why Air Filter RFQ Details Matter Before A Quote

Replacement air filter inquiries are easier to review when the buyer sends clear information at the beginning. A request that only says "air filter" may need several follow-up questions before quotation, because the filter type, size, frame, seal, efficiency grade, airflow, and installation position can all affect the review.

This guide is for buyers preparing an RFQ for pre filters, medium efficiency filters, high efficiency filters, pocket air filters, panel filters, V-bank or compact filters, activated carbon air filters, or other replacement air filters used in HVAC, air handling, ventilation, or industrial equipment.

The purpose is to help buyers prepare useful information before asking for a quotation. It is not a certification statement, cleanroom approval, medical-use approval, airflow guarantee, pressure-drop guarantee, service-life guarantee, or universal replacement confirmation.

Quick RFQ Checklist Before Requesting A Replacement Air Filter Quote

Before sending an inquiry, prepare as many of these details as possible:

• Air filter type or product family if known.
• Outside width, height, and depth.
• Frame material and frame profile.
• Gasket, seal, gel seal, or no-seal information.
• Efficiency grade or class if known.
• Airflow and pressure drop if available.
• Temperature, humidity, or special air condition if relevant.
• Installation direction or airflow direction if known.
• Old label, model number, part number, or drawing number.
• Equipment, AHU, box, frame, or housing model if available.
• Photos of the full filter, label, frame, seal, and installation position.
• Quantity and target replacement schedule.
• Any required documentation or testing request from the project.
• Unknown details clearly marked as unknown.

If some information is missing, do not guess. A clear note such as "pressure drop unknown" or "efficiency grade to be confirmed" is usually more useful than an uncertain value.

Identify The Air Filter Type

The first step is to describe the filter type as clearly as possible. Many replacement problems start because the buyer and supplier use different names for a similar-looking filter.

Common Air Filter Types Buyers Mention

Useful product descriptions can include:

• pre filter;
• medium efficiency air filter;
• high efficiency filter;
• panel filter;
• pocket or bag air filter;
• compact filter or V-bank filter;
• activated carbon air filter;
• custom-size air filter;
• filter used inside an AHU, HVAC unit, filter box, or air-handling equipment.

If the exact name is known from the old label or drawing, send it exactly as shown. If the name is uncertain, send photos instead of forcing a product name.

When The Exact Filter Name Is Unknown

If you do not know the exact filter name, send:

• a front photo;
• a side photo showing depth;
• a close photo of the label;
• a frame-corner photo;
• a seal or gasket photo;
• a photo of where the filter is installed.

These photos can help identify whether the request is closer to a pre filter, medium efficiency filter, high efficiency filter, or another air filter construction. Photos support review, but they do not replace dimensions or project requirements.

Measure Width, Height, Depth, And Frame Details

Dimensions are usually the most important RFQ fields for replacement review. Measure the outside width, outside height, and depth or thickness. Use the same unit throughout the request and mark whether the dimensions come from an old label, drawing, or manual measurement.

Size Details To Send

Helpful size information includes:

• outside width;
• outside height;
• depth or thickness;
• flange size if used;
• frame step or special edge profile if visible;
• tolerance requirement if the project has one;
• quantity for each size if more than one size is needed.

If the old filter is deformed or damaged, explain that the measurement comes from a used sample. Send label or drawing information if available so the measured size can be compared during review.

Frame And Construction Details To Send

Frame and construction details can affect quotation review even when the outside size looks correct. Useful details include:

• frame material if known, such as paper, cardboard, galvanized frame, aluminum frame, plastic frame, or another specified material;
• frame thickness or profile photos;
• pocket depth or pleat structure if visible;
• separator or mini-pleat structure if applicable;
• airflow direction mark if shown;
• label information from the old filter.

Do not assume two filters are interchangeable only because the width and height look similar. Depth, frame profile, seal position, airflow direction, and documentation requirements may still need separate review.

Gasket, Seal, And Installation Details

Some air filters use a gasket, foam seal, gel seal, knife-edge arrangement, or other sealing detail. Before quotation, record the seal location and take close photos.

Helpful seal and installation details include:

• gasket location, such as upstream side, downstream side, both sides, or side frame;
• gasket width and thickness if measurable;
• gel seal groove information if present;
• knife-edge or special frame-contact detail if present;
• installation direction or airflow direction;
• equipment, AHU, box, or housing model if known;
• photos before the old filter is removed, if safe and practical.

Seal details should be treated as replacement-review information. This checklist does not confirm final fit or leak performance from photos alone.

Efficiency Grade, Airflow, And Pressure Drop If Known

Efficiency grade, airflow, and pressure drop can be useful RFQ details, but they should be handled carefully. If the old label, project specification, drawing, or equipment document shows these values, include them with the request. If they are unknown, mark them as unknown.

Useful operating and performance-related information includes:

• efficiency grade or class if shown on the label or project document;
• airflow if available;
• initial or final pressure drop if available;
• temperature range if relevant;
• humidity or moisture condition if relevant;
• dust, odor, oil mist, aerosol, or process air condition if relevant;
• documentation or testing requirement if the project has one.

The final efficiency grade, airflow, pressure-drop requirement, test documentation, and suitability should be reviewed according to the actual project. This page does not provide a guarantee of performance or compliance.

Photos, Labels, Drawings, And Unknown Information

Photos and old labels are often the fastest way to reduce back-and-forth before quotation. A partly damaged label can still be useful if it shows size, model, airflow, efficiency grade, frame type, or part number.

What To Include In Photos

Try to include:

• full front view;
• full side view showing depth;
• label close-up;
• frame corner close-up;
• gasket or seal close-up;
• pleat, pocket, separator, or V-bank structure if visible;
• installation position or housing photo;
• damaged or unusual area if replacement is related to a problem;
• old drawing, purchase record, or part number if available.

Keep the camera square to the label and use good lighting. If using a ruler or tape measure, make sure the numbers are readable.

How To Mark Unknown Details

If a value is not available, write it as unknown. For example:

• efficiency grade: unknown;
• pressure drop: unknown;
• airflow: unknown;
• frame material: to be confirmed from photo;
• old label: partly damaged.

Clear unknown information helps the supplier ask focused follow-up questions. It also reduces the risk of quotation review based on guessed data.

FAQ

What Information Is Needed For An Air Filter Replacement RFQ?

A useful RFQ usually includes filter type, width, height, depth, frame material, gasket or seal detail, efficiency grade if known, airflow and pressure drop if available, old label, equipment model, photos, quantity, and documentation requirements if any.

How Do I Measure An Air Filter For Replacement?

Measure the outside width, outside height, and depth. If there is a flange, special frame profile, gasket step, or unusual edge, photograph it and provide those details separately. Mark whether the dimensions come from a drawing, label, or manual measurement.

What Efficiency Grade Should I Provide?

Provide the efficiency grade or class shown on the old label, drawing, or project specification if available. If it is unknown, mark it as unknown and send photos, equipment information, and any project requirements for review.

Why Are Airflow And Pressure Drop Useful For A Quote?

Airflow and pressure-drop information can help the supplier understand the operating context and documentation needs before quotation. If these values are not available, state that they are unknown instead of guessing.

Can I Request A Custom Air Filter Size?

A custom-size request can be reviewed when the buyer provides size, depth, frame and seal details, filter type, quantity, photos, and application information. Final review still depends on the actual project requirements and installation details.

Requesting An Air Filter Replacement Quotation

A clear replacement air filter RFQ should help the supplier understand the product type, size, frame, seal, operating context, and available documentation before review.

To request an air filter replacement quotation, please share the filter type, size, depth, efficiency grade if known, frame material, gasket or seal details, airflow or pressure drop if available, quantity, and photos of the existing filter or label.

If the request may involve liquid filtration, dust bags, cages, cartridges, or housings, buyers can choose the right RFQ checklist from the filtration RFQ guide hub.

For related product information, buyers can review SFFILTECH air filter products, pre air filter options, medium efficiency air filters, and high efficiency filter categories. For quotation support, contact SFFILTECH.